Improve the FuncUnit.com build

[chasenlehara]

You can run make to build & deploy the FuncUnit site, but the way it works seems like a hack:

• The site folder has its own Makefile and package.json, which seems odd
• At least one file is force-added unnecessarily (that whole script could probably use some attention/verification)
• Static resources are loaded from different folders, depending on which main section you’re on (i.e. the home page loads resources from site/static, while the Guides page loads from guides/static)

Home page:

Guides page:

[chasenlehara]

make doesn’t work out of the box on Windows. In the 2017-05-12 contributors meeting we discussed converting it to a Node.js script and using ShellJS.

[chasenlehara]

Building the site is not working for me on Node 8 and npm 5 (it spits out an error about not being able to find brace-expansion).

[chasenlehara]

Basically everything in the original issue description still needs to be done, but we’re part way to making things better with Replace the Makefile with a Node script.

I’m moving this issue to the backlog because the rest of the fixes are not as urgent.

Another note: with the above PR, I was able to deploy the site with Node 8.1.4 and npm 5.3.0